I look at it a little differently. I enjoy doing my own minor mods such as putting in chassis damping on CD and DVD players, using different vibration control under TT and other electronics (yes, even amps), using top clamps, etc.

I look at these tweaks as experiments, and I do them to try and improve the overall sound, to try and learn from them as experiments and because I enjoy it.

When I have equipment modded, I do it for the same reasons. Therefore, I have only had mods done to equipment thatI have had in my system for a while. I am also prepared to not like the mod and get rid of the piece. This has happened twice out of about 10 modifications I have had done over the years.

If you are worried about getting your money back by selling the piece later then modding may not be for you. In my experience the return from selling has always been a lower percentage of the total cost for modded pieces. For me it was not a big deal since I enjoyed the experience, the change and the information I learned from the process. I view modding as another method for upgrading/changing your system and its overall sound.

So my advice is to do it if you enjoy it, realize it is a gamble (but so is swapping out components) and don't develop an ulcer worrying about it too much. As always YMMV